Spring 2012 Flashcards
(28 cards)
The penetrating power of the xray is determined by:
kilo-voltage
A definition of Radiographic contrast would be:
tonal relationship between one density and another
The distance between the parts to be radiographed and the image receptors is commonly referred to as:
OID = object image distance
Which exposure parameter will not increase the amount of density of a radiograph
increased focal film distance
Doubling the focal film distance requires ___ to compensate and maintain the film density.
4x the mAs
The “ten day rule” for females of child bearing age refers to performing non emergency abdominal pelvic xrays:
during the 10 days after the onset of menstruation
The principle electrostatic law implies…
an electron will repel an electron
The function of a screen is to
convert xrays to light
Of the following, which type of radiation is the major constituent (largest portion) emitted from the target?
Bremestrahulung Radiation
According to lecture, which of the following is the most frequent cause of repeat radiographs?
Under exposure
What exposure factor will produce the most radiographic contrast?
highest mA, lowest kV
In order to maintain density, miliaperage and exposure time are found to be ___ each other?
inversely proportional to
A ___kV change is the minimum necessary to produce noticeable (minor) change in penetration on a radiograph from the original used at 5.5 kV
10% –> 5kV
An increase in radiograph factors from the normally expected radiographic chart would be required when a patient has which of the following contraindications?
Emphysema
What corrections should be made for an AP projection of the pelvis if the greater trochanters are seen partially overlapping the femoral necks?
Invert the lower extremity 15
An oblique view of the lumbar spine shows one pedicle placed over the posterior half of the VB. The position was
over rotated
What is the best way to explain to patient that they do not own the radiographs taken in your office?
- they are part of ones medical legal record
- the bill cover the procedure and diagnosis
- they will be available, should they be needed by professionals elsewhere
A radiograph with many different shades of density poses___
low contrast
With all other factors unchanged, if OI is reduced, image magnification will
directly decrease
Which of the following is most essential in producing radiogaphic image
penetration
Which of the following interactions between xray photos and matter makes the most significant contribution to patient dose?
photoelectric effect
In which of the following radiographic examination is collimation to the film size, or less, of greatest importance in a possibly pregnant female patient?
Chest
Which of the following scenarios would result in unacceptable film of a radiograph?
a. you picked a kV setting 7.5% higher than the optimum
b. you measured the patients thickness and are off by 2cm
c. you miscalculated the mAs and its 23% below the optimum
d. you set the SID at 42” instead of 40
e. none of the above
e. none of the above
Which of the following is (are) demonstrated in the oblique position of tehe spine?
IVF
Pedicles
Apophyseal Joints
IVF and Pedicles
